/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.phoenix.repository.query.jql;

import javax.jcr.query.qom.Join;
import javax.jcr.query.qom.JoinCondition;
import javax.jcr.query.qom.QueryObjectModelConstants;
import javax.jcr.query.qom.Source;

import net.phoenix.repository.query.jql.antlr.JQLTokenTypes;
import antlr.collections.AST;

/**
 * Jigsaw server
 * 
 * @author <a href="shamphone@gmail.com">Li XiongFeng</a>
 * @date 2012-4-22
 * @version 1.0.0
 */
public class JoinAST extends JQLBaseAST implements Join {

	private Source left;
	/**
	 * 
	 */
	private static final long serialVersionUID = 5265191955968622841L;

	public void setLeft(Source left) {
		this.left = left;
	}

	public String getJoinType() {
		if (this.getNumberOfChildren() == 3)
			return this.getFirstChild().getText();
		return QueryObjectModelConstants.JCR_JOIN_TYPE_INNER;
	}

	public JoinCondition getJoinCondition() {
		AST child = this.getFirstChild();
		while (child != null) {
			if (child.getType() == JQLTokenTypes.WITH)
				return ((JoinConditionAST) child).getJoinCondition();
			child = child.getNextSibling();
		}
		return null;
	}

	@Override
	public Source getLeft() {
		return this.left;
	}

	@Override
	public Source getRight() {
		if (this.getNumberOfChildren() == 3)
			return (Source) this.getFirstChild().getNextSibling();
		else
			return (Source) this.getFirstChild();
	}

	@Override
	public String toJQL() {	
		return "JOIN "+super.toJQL();
	}

}
